Build each host

.github/workflows/build.yml

@@ -16,7 +16,8 @@ jobs:
           nix_path: nixpkgs=channel:nixos-unstable
       - name: "List hosts"
         id: hosts
-        run: nix eval .#nixosConfigurations --apply builtins.attrNames --json
+        run: |
+          nix eval .#nixosConfigurations --apply builtins.attrNames --json
     outputs:
       hosts: ${{ steps.hosts.outputs }}
 
@@ -30,5 +31,11 @@ jobs:
         hostname: ${{ fromJSON(needs.determine_hosts.outputs.hosts) }}
 
     steps:
-      - run: echo "${{ matrix.hostname }}"
+      - name: "Define host"
+        env:
+          hostname: ${{ matrix.hostname }}
+        run: |
+          echo "${hostname}"
+      - run: |
+          nixos-rebuild build --flake ".#${hostname}"